HOPKINS AND ALLEN MOD.29 rifle

I have a Hopkins and Allen cap and ball rifle.The only info on it, is on the barrel.It reads MOD.29
HOPKINS AND ALLEN
00512 CAL.50
BLACK POWDER ONLY
Can anyone give me any info on when this gun was made? I've checked out some pretty informative sites.I found out that the co. started out as Hopkins and Allen in 1868,then later changed to Hopkins and Allen mfg co. then later to Hopkins and Allen Arms co. I can't seem to get any info on the earlier Hopkins and Allen.I have a friend that is an antique gun collector, he said he thinks the serial#00512 is the 512th rifle made of this model.

Definitely a NUMRICH/Gun Parts Corp. made firearm - a modern reproduction made from older parts.
Numrich also "made" a number of other firearms from parts kits they purchased over the years - Thompson Auto Ornance comes to mind.